Safety-valve.



,PATENTED JAN. 14, 1908.

. J. H. THIELE. SAFETY VAL E. AfPLIOATION FILED APR. 24,1907.

45 i pipe 4 wl'iich is the return pipe."

JOHNH. THIELE, or NEW roman, Y. f "1 SAFETY-VALVE.

To all whom it may concern:

Be it known that 1, JOHN H. THIELE, acitizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Safety- Valve, of which the following is a full, clear,

' and exact description.

My invention relates to safety valves, my more particular object being to produce a type of safety valve suitable for general use but of peculiar value in connection with steam and hot' water heating plants.

Reference is to be had to the accompanying drawin' forming a part of this specification, in whic the figure-represents a vertical sec tion through one form of my improved safety valve, showing the positions of the mercury tray and the two ventpipes, the returning funnel and the bafllc. I A cylindrical shell 1 is provided with heads 2-, 3, the heads being fitted with pipes 4, 5, the pipe 5 representing the exhaust through which the steam or excessive hot water may be thrown ofl'.

At 6 isa tray mounted upon brackets 7 and filled with mercury 6?. A [use plug is shown at 8. A funnel 9 is providedwith an annular flange 10 secured within the shell 1 by aid .of rivets ll, orequivalentfast-fixings. This fun nel is provided with a neck 12 which is iitted with pipes 13, 14 (hipending therefrom. .The pipe 14 is larger than the pipe 13 and is provided with a projection 15 and with slots 16 upon each side of the same. The purpose of- 'thus shaping the lower end of the pipe 14 is to insure that it will always be open. The

- ell'ective open end of the pipe 14 projects be low the open end of the pipe 13.

A ballle plate 17 is mounted upon brackets 18 and depends from the head 3, the center of this batlle plate being over the pipes 13,]

I 14. -A pipe 19 taps into the side of the shell 1 and may be designated as the steam pipe or hot water pipe, as distinguished from the The operation of my device is as follows? The pipes 4, 19 bcinp connected up directly with the heating system (steam or hot water, as the casc'may be) the shell 1 thereupon wholly 'or partially fills with. steam. The water contained in it may rise above the mercury tray (5, but this fact is immaterial for the reason that the mercury can neither flow nor dissolve. The pressure upon the Specification. of Letters 'Patent.

Application filed Apr-i124. 1907- Sarial No. 370.008-

within this pipe is upper surface of the mercury 6* causes the Patented. Jan. 14, 1908.

latter to rise in the pipes 13, -14, and ultimately to enter the return funnel 9. As soon, however, as the pressure reaches a predetermined limit, the lower end of the tube 13 is exposed and the excessive steam thereupon lifts the column of mercury contained within the pipe 13 and makes its escape. In doing this the mercury is rojected u wardly from the pipe 13 and stm 'es the be a plate 17, runningthenc'e into thefunnel 9, and the steam bubbling up and escaping through -the mercury thus contained in the fun nel. This operation will ordinarily giveall the relief necessary to save the system from damage due' to excessive-pressure of either steam or hot .water. Su pose, however, that owing to a sudden ebul ition somewhere in the system it should happen that there is an excessive pressure at once forced upon the system so. that the capacity of the pipe 13 .is not great'enough to afl'ord adequate relief. In this case the level of the mercury 6 de scends still further so that steam or hot Water is admitted through the mutilations 16 into the pipe 14, and the mercury contained thrown upward against the baffleplate 1'7. Th steam or hot water,

as the case may be, may now escape freely.

throughboth pipes 13, 14.

The use of mercury insures positive action; that is to say, the safety valve, though capable of opening to various degrees, as above explained, is nevertheless always either openor shut, and there can be no undesirable leakage or incidental escape of steam or water through the apparatus, except such as is called for by the general condition of the ressure.-

T 1e device may be cheaply constructed and requlres no especial skill in its manipulation.

Having, thus described my invention; .1- clalm as new and desire to secure by Letters Patent: i i

1. The combination of a cylindrical shell,

ebrackets disposed within ,said cylindricalshell, a tray connected with said brackets and supported thereby, said tray being providod with a deep central portion, a volume of liquid containedwithin said tray, a funnel mounted within said cylindrical shell and connected thereto, so as to form a partition,

thus dividing said shell into different compartments, a pipe fitted into said funnel and extending therefrom below the level of said liquid, and means for admitting a fiuid under v i V I X I i I pressure into the compartment containing 1 and a pipe izonnfeete d with said funnel and said tray. extendmgbeloWthelevel of said-liquid in 2. The combination of a shell, a funnel. said tray. I dis osed within said shell and connected gas: .111 testimony whereof I have signed my 15 5 tig t thereto so as to form separate eompartname to this specification in the presence of ments Within said shell, a tray separate from l two subscribing witnesses. said shell, brackets mounted upon said shell H 'THIELE for supporting said tray, means for admit? ting pressureioi' an aeriform body into the Witnesses a 10 compartment of said shell oontainin said-1 JOHN J. LYNCH, 0

tray, aheavy li uid located within sai tray, Loms THIELE. 

